Chakles w



C. W. LOVELL.

PAPER CUTTING MACHINE.

APPLICATION FILED MAR. 19. 1919.

l ,308,852, ate11ted J uly 8, 1919.

W-ZZea CHARLES w. LOVELL, or BROOKLYN, NEW YORK.

PAPER-CUTTING MACHINE.

Specification of Letters Patent.

Patented July 8, 1919.

Application filed March 19, 1919. Serial No. 283,565.

T 0 all whom it may concern Be itknown that I, CHARLES V. LOVELL, a citizen of the United States, and resident of Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Paper-Cutting Machines, of which the following is a specification.

The invention relates to improvements in paper-cutting machines, commonly known as lever p'aper cutters, in which hand Y power is employed for reciprocating a knife in a shearing manner to cut a pile of sheets against a cutting-block.

Ordinarily, in the operation of devices of this character, the cutting movement of the knife is stopped by its engagement with the opposing relatively soft wood-cutting block,

thereby causing a penetration of the latter which gradually increases under repeated actions to form an abnormal recess in the block of undesirable depth. As the depth of the recess increases, the walls thereof exert a correspondingly greater frictional resistance to the withdrawal of the knife in its upward movement from the block, the

resistance thus offered being suflicient under hand operation to considerably limit the power and capacity of the machine. Furthermore, the recess thus formed in the block offers a lateral clearance space for the beveled cutting edge of the knife, which in its action tends to deflect or spread the lowermost sheets of the pile into the recess and thereby sever the work unevenly. .To overcome these difficulties in a measure, it is common practice to frequently shift the position of the block and present a new cutting surface for the knife, or to renew the block entirely, both means being attended with loss of time and expense.

The object of the present invention is to provide -means for overcoming the abovement-ioned disadvantages by limiting the extent of penetration or recess of the block to a predetermined depth necessary for a clean cutting action on thework, and to maintain such depth by stopping the cutting movement of the knife independently of the resistance ofi'ered by the block. A further object provides convenient means for adjusting this downward movement, or extent of penetration, without disturbing the adjustment of the knife with respect to its connected knife-stock. And the invention also provides means for absorbing the shock due to suddenly arresting the movement of the cutting parts under excessively or carelessly applied manual operating force.

In describing the invention in detail, reference is had to the accompanying drawings, forming a part of this specification, and wherein like characters of reference are used to designate corresponding parts throughout the several views and in which:

Figure 1 is a front elevation of a papercutting machine shown with the improved stop attached thereon; Fig. 2, a transverse view of the machine, with certain of its parts shown in section; and Fig. 3 is an enlarged detail view of the step.

In the drawings, numerals 1 and 2 designate the main frames-of the machine, provided with the lower cross-brace 3 and the upper brace or yoke 4. and between said braces is secured the fixed Work-table 5. The frames are provided in the usual manner with ways to slidingly receive the knifestock 6 andthe clamp-head 7, the latter being constructed and operated in well-known manner, the screw 8 and the hand-wheel 9 indicating the operating means. The cutting-knife 10' is detachably secured by screws in conventional manner to the knifestock 6, which is pivotally suspended by the link-bars 11 and 12, the .latter having an extended arm 13, engaged by one. end of a connection-rod 14, the opposite end thereof being pivotally connected to the short arm 15 of an actuating hand-lever 16, the latter being fixedly connected to the arm and mounted for rocking movement on the pin 17, carried by the brace 3. The several parts above described constitute a well-.

known form of hand lever aper cutter, in which by means of the ham? lever the knife 10 in its cutting action is forced against the cutting block 18.

. For limiting the downward or cutting movement of the knife, a base 19 is provided, having at one end a hinge connection 20, in which is pivotally mounted a stop-plate 21, the movement of which about its pivotal point is controlled by the adjustment screw 22, one end thereof beinghinged to the plate while the opposite end extends through arecessed perforation in the base and is provided with an adjusting nut A helical compression spring 24 surrounds the adjustment screw, extending into the recessed portion and bearing at'one'endagainst the interior shoulder of the recess, the opposite or outer end of the spring bearing against the stop-plate, or the extension thereof that engages the hinged end of the adjustment screw. The s ring serves to project or outwardly urge t 1e stop-plate 21 from the base 19 in opposition to the adjusting nut 23, and by adjusting the latter, the pro ecting movement of the plate may be readily varied. The base 19 is further provided with a threaded perforation engaged by a stopscrew 25, having a lock-nut 26, arranged to 'adjusta'bly hold the screw at any desired position therein, whereby the projecting end of the screw is adapted to engage and adjustably limit the inward movement of the stopplate. The has 19 is also provided with connection holes 2 through which screws 28 pass and serve to attach the base to the knifestock 6 of the machine, the position thereon being adjacent the main frame 1, and with which the stop-plate 21 of the base engages as the knife-stock and knife in their joint downward and lateral shearing movement reach their lowermost cut-ting position, the said engagement operating to swing the stop-plate in opposition to the yielding spring 2% against the end of the stop-screw 25, whereupon the movement of the cuttingknife is arrested.

Itwill be obvious that by adjusting the stop-screw with respect to the stop-plate, the downward or cutting movement of the knife and the depth of'its penetration into the cuttingblock may be readily varied to insure a complete cutting action on the work. Also it will be evident that the yielding action of the spring will serve to reduce or overcome the shock dueto the sudden stoppage of the knife.

lVhat I claim as my invention and desire to secure by Letters Patent, is: Y

1. In a paper-cutting machine, the combi nation of a knife-stock mounted for movement in the fixed frame of the machine and arranged for manual operation, a cuttingknife for said knife-stock, a cutting-block of relatively soft material arranged for penetration by said knife, a base fixed to said knife-stock adjacent the fixed frame of the machine, a stop-plate movably mounted on said base and adapted to engage the fixed frame of the machine, and means carried by said base for adjusting the movement of said stop-plate, whereby the cutting movement of the knife is variably limited with respect o the euttingdilock.

in a paper-cutting machine, the combination of a knife-stock mounted for movement in the fixed frame of the machine and arranged for manual operation, a cuttingknife for said knife-stock, a cutting-block of relatively soft material arranged for penetration by said knife, a base fixed to said knife-stock adjacent the fixed frame of the machine, a stop-plate movably mounted on said base and adapted to engage the fixed frame of the machine, means carried by said base for adjusting the movement of said stop-plate, and a spring interposed between said base and stop-plate to yieldingly arrest the cutting movement of said knife.

In a paper-cutting machine. the combination of a knife-stock mounted for movement in the fixed frame of the machine and arranged for manual operation, a cuttingknife for said knifestock, a cutting-block of relatively soft material arranged for penetration by said knife. :1 base fixed to said knife-stock adjacent the fixed frame of the machine, a stop-plate movably mounted on said base and adapted to engage the fixed frame of the machine. a spring arranged to outwardly move or project said stop-plate with respect to said base, interengaging means between said-base and stopplate for controlling the. projecting movementof the latter, and a. stop-screw adjustable in said base and arranged to engage and limit the inward movement of said stopplate.

Signed at New York in the county of New York and-State of New York this 12th day of March A. D. 1919.

CHARLES V. LOVELL. 

